*{
    margin: 0;
    padding: 0;
}
.contact{
    /* 间距 */
    padding: 30px o;
  
    height: 450px;
}
.feature{
    padding: 50px 0;
    height: 350px;
    }
    .feature_header{
        text-align: center;
        margin-bottom: 40px;
    }